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New Cisco 200-125 Exam Dumps Collection (Question 6 - Question 15)

Question No: 6

What is the first 24 bits in a MAC address called?

A. NIC

B. BIA

C. OUI

D. VAI

Answer: C

Explanation:

An Organizationally Unique Identifier (OUI) is a 24-bit number that uniquely identifies a vendor, manufacturer, or other organization globally or worldwide.

They are used as the first 24 nits of the MAC address to uniquely identify a particular piece of equipment.


Question No: 7

CORRECT TEXTCCNA.com has a small network that is using EIGRP as its IGP. All routers should be running an EIGRP AS number of 12. Router MGT is also running static routing to the ISP.

CCNA.com has recently added the ENG router. Currently, the ENG router does not have connectivity to the ISP router. All over interconnectivity and Internet access for the existing locations of the company are working properly.

The taskis to identify the fault(s) and correct the router configuration(s) to provide full connectivity between the routers.

Access to the router CLI can be gained by clicking on the appropriate host.

All passwords on all routers arecisco.

IP addresses are listed in the chart below.

MGT

Fa0/0 u2013 192.168.77.33

S1/0 u2013 198.0.18.6

S0/0 u2013 192.168.27.9

S0/1 u2013 192.168.50.21

ENG

Fa0/0 u2013 192.168.77.34

Fa1/0 u2013 192.168.12.17

Fa0/1 u2013 192.168.12.1

Parts1

Fa0/0 u2013 192.168.12.33

Fa0/1 u2013 192.168.12.49

S0/0 u2013 192.168.27.10

Parts2

Fa0/0 u2013 192.168.12.65

Fa0/1 u2013 192.168.12.81

S0/1 u2013 192.168.50.22

Answer:

On the MGT Router: Config t

Router eigrp 12

Network 192.168.77.0


Question No: 8

How does a DHCP server dynamically assign IP addresses to hosts?

A. Addresses are permanently assigned so that the host uses the same address at all times.

B. Addresses are assigned for a fixed period of time. At the end of the period, a new request for an address must be made, and another address is then assigned.

C. Addresses are leased to hosts. A host will usually keep the same address by periodically contacting the DHCP server to renew the lease.

D. Addresses are allocated after a negotiation between the server and the host to determine the length of the agreement.

Answer: C

Explanation:

DHCP works in a client/server mode and operates like any other client/server relationship. When a PC connects to a DHCP server, the server assigns or leases an IP address to that PC. The PC connects to the network with that leased IP address until the lease expires. The host must contact the DHCP server periodically to extend the lease. This lease mechanism ensures that hosts that move or power off do not hold onto addresses that they do not need. The DHCP server returns these addresses to the address pool and reallocates them as necessary.


Question No: 9

Refer to the exhibit.

The two connected ports on the switch are not turning orange or green. What would be the most effective steps to troubleshoot this physical layer problem? (Choose three.)

A. Ensure that the Ethernet encapsulations match on the interconnected router and switch ports.

B. Ensure that cables A and B are straight-through cables.

C. Ensure cable A is plugged into a trunk port.

D. Ensure the switch has power.

E. Reboot all of the devices.

F. Reseat all cables.

Answer: B,D,F

Explanation:

The ports on the switch are not up indicating it is a layer 1 (physical) problem so we should check cable type, power and how they are plugged in.


Question No: 10

What authentication type is used by SNMPv2?

A. HMAC-MD5

B. HMAC-SHA

C. CBC-DES

D. community strings

Answer: D

Explanation:

SNMP Versions

Cisco IOS software supports the following versions of SNMP:

u2022SNMPv1 u2014 The Simple Network Management Protocol: A Full Internet Standard, defined in RFC 1157. (RFC 1157 replaces the earlier versions that were published as RFC 1067 and RFC 1098.) Security is based on community strings.

u2022SNMPv2c u2014 The community-string based Administrative Framework for SNMPv2. SNMPv2c (the "c" stands for "community") is an Experimental Internet Protocol defined in RFC 1901, RFC 1905, and RFC 1906. SNMPv2c is an update of the protocol operations and data types of SNMPv2p (SNMPv2 Classic), and uses the community-based security model of SNMPv1.

u2022SNMPv3 u2014 Version 3 of SNMP. SNMPv3 is an interoperable standards-based protocol defined in RFCs 2273 to 2275. SNMPv3 provides secure access to devices by a combination of authenticating and encrypting packets over the network.

SNMP Security Models and Levels

Model Level

Authentication Encryption What Happens v1 noAuthNoPriv

Community String No

Uses a community string match for authentication. v2c

noAuthNoPriv Community String No

Uses a community string match for authentication. v3

noAuthNoPriv Username

No

Uses a username match for authentication. v3

authNoPriv MD5 or SHA

No

Provides authentication based on the HMAC-MD5 or HMAC-SHA algorithms. v3

authPriv MD5 or SHA DES

Provides authentication based on the HMAC-MD5 or HMAC-SHA algorithms. Provides DES 56-bit encryption in addition to authentication based on the CBC-DES (DES-56) standard.

Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_2/configfun/configuration/guide/ffun_c/fcf014.h tml


Question No: 11

Refer to the exhibit.

What is the cause of the Syslog output messages?

A. The EIGRP neighbor on Fa0/1 went down due to a failed link.

B. The EIGRP neighbor connected to Fa0/1 is participating in a different EIGRP process, causing the adjacency to go down.

C. A shut command was executed on interface Fa0/1, causing the EIGRP adjacency to go

down.

D. Interface Fa0/1 has become error disabled, causing the EIGRP adjacency to go down.

Answer: C

Explanation:

The first lines of the message show that a configuration change was made, and that the fa0/1 interface changed to a state of administratively down. This can only be done by issuing the shutdown command. The last line indicates that this caused an EIGRP neighbor adjacency to go down.


Question No: 12

Refer to the exhibit.

Which address range efficiently summarizes the routing table of the addresses for router Main?

A. 172.16.0.0./21

B. 172.16.0.0./20

C. 172.16.0.0./16

D. 172.16.0.0/18

Answer: B

Explanation:

The 172.16.0.0./20 network is the best option as it includes all networks from 172.16.0.0 u2013 172.16.16.0 and does it more efficiently than the /16 and /18 subnets. The /21 subnet will not include all the other subnets in this one single summarized address.


Question No: 13

A network administrator needs to configure port security on a switch. Which two statements are true? (Choose two.)

A. The network administrator can apply port security to dynamic access ports.

B. The network administrator can apply port security to EtherChannels.

C. When dynamic MAC address learning is enabled on an interface, the switch can learn new addresses, up to the maximum defined.

D. The sticky learning feature allows the addition of dynamically learned addresses to the running configuration.

E. The network administrator can configure static secure or sticky secure MAC addresses in the voice VLAN.

Answer: C,D

Explanation:

Follow these guidelines when configuring port security:

+ Port security can only be configured on static access ports, trunk ports, or 802.1Q tunnel ports.

+ A secure port cannot be a dynamic access port.

+ A secure port cannot be a destination port for Switched Port Analyzer (SPAN).

+ A secure port cannot belong to a Fast EtherChannel or Gigabit EtherChannel port group.

+ You cannot configure static secure or sticky secure MAC addresses on a voice VLAN.

+ When you enable port security on an interface that is also configured with a voice VLAN, you must set the maximum allowed secure addresses on the port to at least two.

+ If any type of port security is enabled on the access VLAN, dynamic port security is automatically enabled on the voice VLAN.

+ When a voice VLAN is configured on a secure port that is also configured as a sticky secure port, all addresses seen on the voice VLAN are learned as dynamic secure addresses, and all addresses seen on the access VLAN (to which the port belongs) are learned as sticky secure addresses.

+ The switch does not support port security aging of sticky secure MAC addresses.

+ The protect and restrict options cannot be simultaneously enabled on an interface.

(Reference: http://www.cisco.com/en/US/docs/switches/lan/catalyst3550/software/release/12.1_19_ea1

/configuration/guide/swtrafc.html)

Topic 11, Infrastructure Management

853.Scenario

Refer to the topology. Your company has connected the routers R1, R2, and R3 with serial

links. R2 and R3 are connected to the switches SW1 and SW2, respectively. SW1 and SW2 are also connected to the routers R4 and R5.

The EIGRP routing protocol is configured.

You are required to troubleshoot and resolve the EIGRP issues between the various routers.

Use the appropriate show commands to troubleshoot the issues.

Study the following output taken on R1: R1# Ping 10.5.5.55 source 10.1.1.1 Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 10.5.5.55, timeout is 2 seconds: Packet sent with a source address of 10.1.1.1

u2026u2026.

Success rate is 0 percent (0/5) Why are the pings failing?

A. The network statement is missing on R5.

B. The loopback interface is shut down on R5.

C. The network statement is missing on R1.

D. The IP address that is configured on the Lo1 interface on R5 is incorrect.


Question No: 14

When a DHCP server is configured, which two IP addresses should never be assignable to hosts? (Choose two.)

A. network or subnetwork IP address

B. broadcast address on the network

C. IP address leased to the LAN

D. IP address used by the interfaces

E. manually assigned address to the clients

F. designated IP address to the DHCP server

Answer: A,B

Explanation:

Network or subnetwork IP address (for example 11.0.0.0/8 or 13.1.0.0/16) and broadcast address (for example 23.2.1.255/24) should never be assignable to hosts. When try to assign these addresses to hosts, you will receive an error message saying that they canu2019t be assignable.


Question No: 15

Scenario

Refer to the topology. Your company has connected the routers R1, R2, and R3 with serial links. R2 and R3 are connected to the switches SW1 and SW2, respectively. SW1 and SW2 are also connected to the routers R4 and R5.

The EIGRP routing protocol is configured.

You are required to troubleshoot and resolve the EIGRP issues between the various routers.

Use the appropriate show commands to troubleshoot the issues.

Router R6 does not form an EIGRP neighbor relationship correctly with router R1. What is the cause for this misconfiguration?

A. The K values mismatch.

B. The AS does not match.

C. The network command is missing.

D. The passive interface command is enabled.

Answer: C

Explanation:

The link from R1 to R6 is shown below:

As you can see, they are both using e0/0. The IP addresses are in the 192.168.16.0 network:

But when we look at the EIGRP configuration, the u201cnetwork 192.168.16.0u201d command is missing on R6.



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